Journal Article

Characteristics of the closest known G-type exoplanet host 82 Eri

J. Bernkopf, R. Chini, L.-S. Buda, T. Dembsky, H. Drass, K. Fuhrmann and R. Lemke

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 425, issue 2, pages 1308-1311
Published in print September 2012 | ISSN: 0035-8711
Published online September 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.21534.x
Characteristics of the closest known G-type exoplanet host 82 Eri

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Abstract

We present a consistent model atmosphere analysis and evolutionary tracks for the very nearby G-type star 82 Eri that was most recently announced by Pepe et al. to harbour two or three super-Earth companions with orbital periods of 18, 40 and 90 d. As a bright and high-velocity object, 82 Eri was already realized by Jan Hendrik Oort in his 1926 treatise to be of ‘probably different origin’ and we confirm its being a member of the ancient thick-disc population on account of its outstanding iron-to-magnesium deficiency. Thus, in our immediate neighbourhood – only 6 pc away – there exists a system of extremely old and probably rocky super-Earths that were already formed when the Milky Way was at its infancy, 12 or even 13 billion years in the past.

Keywords: stars: evolution; stars: fundamental parameters; stars: individual: 82 Eri; stars: planetary systems; stars: Population II

Journal Article.  2676 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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